Three drug possession suspects were arrested early Friday after they were found sleeping in a car in a Novato commuter lot, police said.

Police approached the car shortly before 1 a.m. at Atherton and Armstrong avenues, and a search dog detected the smell of drugs inside, said Novato police Sgt. Nick Frey. Police detained the occupants and found numerous bags of marijuana and suspected cocaine inside, Frey said.

Shasta Fox, 23, of Oakland and Casey Fox, 25, of Arcata remained in custody Friday at the Marin County Jail. Courtney Mangas, 21, of Arcata was released on bail, and she could not be reached for comment.